Attachment for steam-engine governors



(No Model) W. J. BUCHANAN. ATTACHMENT EOE STEAM ENGINE GOVERNORS. I

No. 287,620. Patented Oot. 80, 1883 UNITED STATES WILLIAM JOHN BUCHANAN,

PATENT! OFFICE.

OFHUNTI NGTON, INDIANA.

ATTACHMENT FOR STEAM -ENGINE GOVERNOR S.

SPEQIFIGATION forming part of Letters Patent No. 287,620, datedOctO'ber 30, 1883.

' Application filed August 2, 1883. (No model.)

To aZZ whom, it may concern:

Be it known that I, .W. J.,.BUCHANAN, of Huntington, in the county of Huntington and State of Indiana, have invented. certain new and useful Improvements in Attachments for Governors for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make'and use it, reference being had tothe accompanying drawings, which form part of this specification. I

My invention relates to an improvement inattachments for governors for steam-engines; and it consists in the combination, with the driving-pulley, around which the driving-band passes, of a spring-actuated slide, which is connected by a wire, cord, or chain with a clutch on the governor-shaft, with pivoted arms or levers that are made rounding on their outer side, so as to correspond to the shape of the pulley, and which hold the slide in place until the band slips off or becomes broken, as will be more fully described hereinafter.

The object of my invention is to provide an attachment for governors of steam-engines, so that in casethe driving band or belt should become broken or slip off of its pulley the governor will at once become detached or allow complete.

the steam to be shut off before the engine gets beyond control.

Figure lis a side elevation of my invention Fig. '2 is a detached view of the pulley, showing the different parts in position, Fig. 3 is a similar view of the pulley, showing the parts when released by the slipping off or the breaking of the band or belt.

A represents a suitable frame, and B a hollow shaft, which passes through one side, and has the driving band or belt 0 attached-to its outer end. To the innerend of this shaft B is secured the pinion-l), which meshes with a corresponding pinion, F, uponthe governor shaft. Just below this pinion F is placed a sliding clutch, G, which disconnects the stem of the governor when the steam is to be shut off. I

The driving-pulley C may either be grooved, soas toreceive a band, or may be fiat, to receive a belt, as is preferred. To one of the I sides of this pulley ispivoted two levers'or arms,

H, which are made rounding on-their outer sides, so as to correspond to the shape of the pulley. These arms or levels H are made to operate together, and by frictional contact of pins against upper sidesof slots in levers hold slide I in place. These arms orlevers are slotted, and have pinsS upon theslide, which pass through them, for the purpose of holding the slide in place and preventing it from moving the clutch. As longas the band or belt is around the pulley it presses one or both of the arms tightly against the pins S, and thus holds the slide in position. band breaks or slips off from the pulley, these arms or leversare left free to move outward, and the slide is forced outward as far as the slots will allow.

The slide I is made rounding at its outer edge, so as to correspond to the shape of the pulley, and this slide is also kept in place, not only by the pressure of the arms or levers, but by the pressure of the band or belt itself.

The central portion, L, of the pulley extends out so as to be about flush with the arms or levers and the slide, and between the edge of 7 this central portion, L, and the inner side of the slide I is placed a coiled spring, N. Also fastened to this slide is a wire, cord, or chain, 0, provided with a swivel, and which passes through the center of the pulley and through the hollow shaft and fastens to the clutch which disconnects the governor-stem.. As

long as this slide I remains in position the off the steam. While the pulley is in motion the band or belt is bearing againstthe outer side of one or both of the arms or levers, so as to force them tightly in against the pins, while the slide is in that position where it is not held by the band or belt; but assoon as the slide reaches that point where the band or belt comes in contact with its outer edge the band or belt alone is sufficient to keep the slide inposition.

One great trouble with governors which are IOO driven by a band or belt is that in case the band or belt becomes broken or slips off the governor no longer has any efi'ect upon the engine, and the engine then acquires a momentum so great that the engineer loses control over the engine, and then it (technically speaking) runs away. lVhere my invention is used, as soon as the band or belt slips off or becomes broken the slide I is instantly forced outward, and thus causes the cord, wire, or chain to operate the clutch and disconnect the governor-stem. The pressure of the steam forces the valve of governor downward, thus preventing the steam from passing through to the engine; or, in case there is no downward pressure upon the valve, a spring is placed upon the stem, and, acting against the clutch, forces the valve downward.

Having thus described my invention, I claim 1. The combination, in an attachment for steam-governors, of the pulley, with an automatic mechanism which is connected thereto and held in place by means of the pressure of the band or belt, and a suitable connection between this mechanism and the goyernorstem, substantially as shown.

2. In an attachment for steam-governors, the spring-actuated slide, suitable means for holding the slide in place upon thepulley, and a means of connection between this slide and the clutch upon the governorstem, substantially as described.

8. The combination of the driving-pulley, the pivoted holding arms or levers,the springactuated slide, a connecting cord, wire, or chain, the hollow shaft, and the clutch upon the governor-stem, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

\VILLIAM JOHN BUCHANAN.

\Vitnesses: l

CHARLES B. GARRETT, SAML. BUCHANAN. 

